To increase Banner Slideshow arrow size, you can follow these.
#1. On All pages
/* Banner Slideshow arrow size */
.user-items-list-banner-slideshow .user-items-list-banner-slideshow__arrow-button {
width: 100px !important;
height: 100px !important;
}
svg.user-items-list-banner-slideshow__arrow-icon {
width: 50px !important;
height: 50px !important;
}

#2. On Desktop Only
Use this code to Custom CSS box
@media screen and (min-width:768px) {
.user-items-list-banner-slideshow .user-items-list-banner-slideshow__arrow-button {
width: 100px !important;
height: 100px !important;
}
svg.user-items-list-banner-slideshow__arrow-icon {
width: 50px !important;
height: 50px !important;
}
}
#3. On Mobile Only
@media screen and (max-width:767px) {
.user-items-list-banner-slideshow .user-items-list-banner-slideshow__arrow-button {
width: 100px !important;
height: 100px !important;
}
svg.user-items-list-banner-slideshow__arrow-icon {
width: 50px !important;
height: 50px !important;
}
}
#4. Specific Banner Slideshow
First, you need to find Slideshow ID.
Next, use CSS code like this
section[data-section-id="667a87bcafdd5271c4af6ced"] {
.user-items-list-banner-slideshow .user-items-list-banner-slideshow__arrow-button {
width: 100px !important;
height: 100px !important;
}
svg.user-items-list-banner-slideshow__arrow-icon {
width: 50px !important;
height: 50px !important;
}}
